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HTML supports some mechanisms to implement templates: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template https://developer.mozilla.org/en-US/doc

• miki_tyler 5y ago
  There is indeed a <template> tag in HTML but it only works inside the current loaded page, i.e. to render rows inside a table. You cannot use it to include a header or a banner. In addition, the the tag relies on JS to be rendered.